Sung-Hi is filling a sandbox with sand at the rate shown in the table below. Which statement must be true regarding the linear function that represents this situation? Amount of Sand in the Sandbox
Number of Minutes Since Sung-Hi Started
0
1
2
3
4
Amount of Sand in the Sandbox (pounds)
200
220
240
260
280
The initial value must be 0 pounds.
The initial value must be 20 pounds.
The rate of change must be 0 pounds per minute.
The rate of change must be 20 pounds per minute.

Agroup of student volunteers participates in a study designed to assess several behavioral interventions for improving output in a repetitive task. prior to the beginning of the study, all volunteers unknowingly observed, and their output is measured. at the beginning of the study, prior to any intervention, the volunteers perform the same task under the observation of a study administrator, and their overall output increases. which of the following terms describes this phenomenon? a. simpson's paradox b. hawthorne effect are d. novelty effect d. pygmalion effect e. observer-expectancy effect